Bad sign for global warming: Thawing permafrost holds vast carbon pool

Permafrost blanketing the northern hemisphere contains more than twice the amount of carbon in the atmosphere, making it a potentially mammoth contributor to global climate change depending on how quickly it thaws.

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<p><a href="http://www.physorg.com/news139658850.html">Bad sign for global warming: Thawing permafrost holds vast carbon pool</a></p> <p>Permafrost blanketing the northern hemisphere contains more than twice the amount of carbon in the atmosphere, making it a potentially mammoth contributor to global climate change depending on how quickly it thaws.</p>